Kozilek, the Great Distortion

Bracket

• B1 Exhibition — allowed: No restriction at this bracket
• B2 Core — allowed: No restriction at this bracket
• B3 Upgraded — allowed: No restriction at this bracket
• B4 Optimized — allowed: No restriction beyond the banned list
• B5 cEDH — allowed: No restriction beyond the banned list

Why

• No Game Changer, mass land denial, extra turn, tutor or two-card combo

How Lotus Vault estimates a bracket

Bracket: Lotus Vault analysis, with Commander Spellbook flags

Combos

2 known combos.

• Kozilek, the Great Distortion + Mind Over Matter + Lithoform Engine
  Produces: Infinite draw triggers, Infinite looting, Infinite self-discard triggers
  View on Commander Spellbook
• Kozilek, the Great Distortion + Mind Over Matter + Strionic Resonator
  Produces: Infinite draw triggers, Infinite looting, Infinite self-discard triggers
  View on Commander Spellbook

Combos: Commander Spellbook

Rulings

• 2016-01-22 · Wizards of the Coast
  Kozilek's triggered ability checks to see if you have fewer than seven cards in hand when you cast it. Kozilek is on the stack at this time and not in your hand. If you don't, the ability won't trigger at all. If the ability does trigger, it will check again as it tries to resolve. If you have seven or more cards in hand at that time, the ability won't do anything.
• 2016-01-22 · Wizards of the Coast
  If there's an {X} in the mana cost of the card you discard, that X is 0. Any {X} in the mana cost of the target spell will have whatever value was determined for it as the spell was cast.
• 2016-01-22 · Wizards of the Coast
  The mana value of a spell doesn't change, even if it's been cast using an alternative cost (such as an awaken cost). For example, the mana value of a Sheer Drop (a spell with mana cost {2}{W}) that's been cast for its awaken cost of {5}{W} is 3.
• 2016-01-22 · Wizards of the Coast
  To activate the last ability, there must be a legal target: a spell on the stack. That target will determine the value of X and the mana value of the card you discard. You can't activate the ability unless you can match the mana value of a spell on the stack to that of a card in your hand.

Rulings: Scryfall · Wizards of the Coast